Sliding calipers



EI CHALLETI SLIDING CALIPERS.-

APPLICATION FILED ocr. 22.l 1919.

1,35 1,941. I Pmmdsept. 7, 1920.

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PATENT OFFICE.

ETIENNE CHALLET, OF GENVE, SWITZERLAND.

SLIDING CALIPERS.

Specification of Letters Patent.

Patented Sept. 7, 1920.

Application filed Getober 22, 1919. Serial No. 332,424.

To all whom t may concern.'

Be it known that Yl, ETIENNE CHALLn'r, a citizen or `tiwitzerland and aresident ot Geneve, Switzerland, have invented new and nseifnlimprovements in sliding` calipers, 'ot which the following is aspeciiication.

This invention relates to sliding calipers, and itsl objects are toprovide in the tace et the sliding arm thereofa longitudinal angulargroove having its inclined inner sides in thesame plane with the usualinclined sides ot' the vernier thereof; to mark the measuringgraduations or divisions on the inclined sides of the sliding arm and toplace the denetation marks or numerals tor the divisions on the loweriiat face in the groove;

while the vernier snbeivisions and numbers are marked on the inclinedsides and flat top surface respectively of the vernier.

My invention is shown in the annexed drawing, in which Fig-ure l is aplan or' the sliding calipers, and Fig. 2 a section on line -B of Fig.l..

ln the outer iiace (L ot the sliding` arm ot the calipers i make alongitudinal `jroove having inelinei'l sides 7) and c so arranged as tobe in plane with the sides d and e respectively of the Vernier On thesides al and e of the Vernier are marked the usual subdivisions. Thenormal measuringI are marked on the inclined sides l) and c in thegroove and the corresponding' numerals are marked on the lower flat faceg ot said groove, while the subdivisions ot the vernier have thecorresponding denominating numerals on the top tace f. Ey way ofexample, the divisions on corresponding with the subdivisions (l on theVernier, are metric divisions and the divisions on o and 7" respectivelyare English inclrdivisions.

Having thus described my invention, l declare that what l claim anddesire to have patented in the United States of America, is:

In calipers, an arm formed with a longitudinal groove'having inclinedsides provided with scales, the lower part or' said groove being,-provided with marks or numerals corresponding` to the graduation of saidscales and a member slidable along said arm and having inclined faceslying in the same planes as the inclined sides of the arm, said 'facesbeing provided with Vernier graduations to cooperate with said scales.

ETIENNE CHALLET.

divisions for

